Doorcheck



Sept. 8,

G. TRUEBLOOD nooncaacx Filed Aug. 50, 1923 Patented Sept. 8, 1925.

, STATES PAT NT GUYTRUEBLOOD, or ALE-D0, runners, assrenoa or one-Thine To James H. DAY

AND ONE-THIRD T O FRED H ELVING, BOTH OF ALEDO, ILLINOIS."

noonenncx.

Application fi'led kugllst 30,- 1923.- Serial No.- 660,136.- a

T all whom it may concern: 7

Be it known that I, GUY TRUEBLOOD, a citizen of the United States, residing at Aledo, in the county of. Mercer, Stateof Illinois, have invented anew and useful Doorcheck; an'dI do hereby declare the following to be a full, clear, and! exact description of the invention,- such aswill enable others skilled. in the. art to which it appertainsto make and uselthe same;

Theinventioni relates: to door checks, and has for its object to provide a device of this character wherein a spiral spring isutili'zed for closing the door after an opening: operation, and a piston cooperating with the spiral spring for checking the door in its closing operation when released. The piston is pro vided with a crank and connecting rod connection with a shaft, which shaft is controlled by the coiled spring.

A further object is'to provide adjustable means whereby the tension of the coiled spring may be varied for varying the speed of the door towards closed position when released.

A further object is to dispose the coiled spring within a cylindrical casing through which a shaft extends, and to which cylindrical casing and shaft the ends of the coiled spring are secured, and to provide a disc on the upper end of the sleeve provided with lugs engaging notches of the sleeve, which disc is provided with a plurality of apertures for the reception of a pin carried by the rotatable cover, which cover when rotated will vary the tension of the spring and when secured against movement will hold the spring in adjusted position.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes, in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing Figure 1 is a top plan view of the door check, showing the same applied toa door.

Figure 2 is a vertical longitudinal sectional view through the device.

Figure 3 is a top plan view of the sleeve carried disc.

Figure 4 is a top plan view of the sleeve.

Referring to the drawing, the numeral; 1

designates-a conventional form of door'which is hingedly mounted at 2 to adoor fr'ame'3.

Secured to the door frame adjacent the door.

tends downwardly into the? chamber 1-2of the casingA andi-s provided with a1 horizontally disposed crank 13, to which is connected a horizontally disposed connecting rod 14. Connecting rod 14 extends into a cylinder 15, in which cylinder is slidably mounted a piston 16; therefore it will be seen that upon the rotation of the shaft 11 the crank 13 will be rotated and the piston 16 moved inwardly, at which time air will enter the cylinder through the port 17. However when the dOOr 1 is released the spiral spring 8 will rotate theshaft 11 and close the door through the connecting rods 18 and 19, one of which is connected at 20 to the upper end of the shaft 11. However to prevent slamming of the door during the closing operation, under the influence of the spiral spring 8, the piston 16 is primarily designed. During the closing operation the piston 16 will be forced outwardly in the direction of the arrow at and will compress the air in the outer end of the cylinder 15, which air gradually escapes through the port 17 consequently the door 1 will slowly close under the influence of the spring 8 and will not slam.

The upper end of the cylindrical extension 5 is provided with a rotatable cover 21, which is provided with set screws 22 whereby it may be securely locked on the extension 5, and through which cover a rectangular shaped portion 23 of the shaft 11 extends whereby the spring 8 may be tensioned. However to hold the spring 8 tensioned, a disc 24 is provided on the upper end of the sleeve 7, which disc is provided with lugs 25 adapted to be received in recesses 26 in the upper end of the sleeve 7 after the spring 8 has been placed within the sleeve 7. Disc 14 is provided with a plurality of concentric apertures 27 in any one of which a removable pin 28 carried by the cover plate 21 may be received for holding the disc and the sleeve 7 against rotation after the same has been adjusted for varying the tension of the spring 8.

From the above it will be seen that a door check is provided wherein a spiral spring is utilized for closing the door and a piston utilized for checking the action of the coiled spring during the door closing operation. It will also be seen that the tension of the spiral spring may be easily and quickly varied for varying the speed of closing the door, and the parts are reduced to a minimum thereby insuring a positive operation of the device and reducing the possibility of the device getting out of order to a minimum.

The invention having been set forth What is claimed as new and useful is A door closing and checking device comprising a casing, a vertically disposed shaft carried by said casing, a cylindrical extension carried by said casing, and through which the shaft extends, a sleeve disposed within the extension, a coiled spring disposed within the sleeve and having one of its ends anchored to the inner side of the sleeve and its other end anchored to the shaft, a cap adjustably mounted on the extension, an annular flange carried by the cap and engaging the outer side of the cylindrical extension, a disc disposed on the upper end of the sleeve and interengaging the sleeve, said disc engaging the upper ends of the convolutions of the spring and maintaining said convolutions in the same plane during the contraction and expansion of the spring, set screw means carried by the flange for locking the cap in any position to which it may be moved and a removable pin carried by the cap and cooperating with a plurality of concentrically arranged apertures in the disc for holding the spring tensioned, a, crank carried by the shaft within the casing, a piston slidably mounted in the casing adjacent the crank and a connecting rod connecting the piston and the crank.

In testimony whereof I have signed my name to this specification.

GUY TRUEBLOOD. 

